90623947 has 2 divisors, whose sum is σ = 90623948. Its totient is φ = 90623946.

The previous prime is 90623891. The next prime is 90623987. The reversal of 90623947 is 74932609.

It is an a-pointer prime, because the next prime (90623987) can be obtained adding 90623947 to its sum of digits (40).

It is a strong prime.

It is an emirp because it is prime and its reverse (74932609) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90623947 is a prime.

It is not a weakly prime, because it can be changed into another prime (90623987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45311973 + 45311974.

It is an arithmetic number, because the mean of its divisors is an integer number (45311974).

Almost surely, 2^90623947 is an apocalyptic number.

90623947 is a deficient number, since it is larger than the sum of its proper divisors (1).

90623947 is an equidigital number, since it uses as much as digits as its factorization.

90623947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 40.

The square root of 90623947 is about 9519.6610758997. The cubic root of 90623947 is about 449.1737050761.

The spelling of 90623947 in words is "ninety million, six hundred twenty-three thousand, nine hundred forty-seven".